When comparing Blogger vs Postagon, the Slant community recommends Postagon for most people. In the question“What are the best solutions for a personal blog?”Postagon is ranked 17th while Blogger is ranked 19th. The most important reason people chose Postagon is:

Pros

Pro

No ads

You can turn on ads if you want, but you can also keep your Blogger blog ad-free. That is different from WordPress.com (free hosted WordPress) where there are ads, and you cannot do anything about it.

Pro

Custom domain support

You can use either your own URL or a *.blogspot.com URL.

Pro

Supports multiple authors

Multiple people can contribute to a single blog.

Pro

Free

hosted by google

Pro

Allows custom advertisements

Such as project wonderful, or just google adsense,. so you can make money from your blog.

Pro

Javascript friendly

You can include Javascript snippets and widgets (like Pinterest widgets for example) in posts and in sidebar items. This makes it very different from WordPress.com (free hosted WordPress) which does not allow javascript plugins.

Pro

Every Google account has one

If you have a Google account from any other of their services, such as Gmail, Youtube or Google+, you automatically have a Blogger account as well.

Pro

Android and iOS mobile apps

Allows viewing and editing content from your mobile device.

Pro

Analytics integration

There's very basic analytics, but you can upgrade if needed.

Pro

Clean interface

Postagon is very minimalist and clean in its design.

Pro

WYSIWYG & Markdown editors

You can opt to use the What You See Is What You Get editor or write using Markdown syntax.

Pro

Google Analytics support

Postagon has built-in statistics using Google Analytics to help get a better understanding of your visitiors.

Pro

RSS support

You can have people subscribe to your blog using RSS.

Cons

Con

Bad post editor

It is a WYSIWYG html editor, and it would be a bit better if it used <p> tags. Instead it uses divs and brs everywhere, which leads to inconsistent or just crappy typography and spacing.

Con

Limited authorization system

Sadly the authorization system is fairly limited. Co authors can post and publish, without you getting a chance to pre-check their posts as an admin. e.g. you can't give them "create" and not give them "publish" permissions. They can only edit their own posts however.

Con

Can be very slow

Loading times can be huge - results may vary on your use of template, but even a fairly lightweight template can load quite slow.

Con

Not fully HTML4 or 5 compliant

And impossible to get it perfectly accepted by the W3C verifier no matter how much you tinker.